From Kyle Race Engines:
"Current Honda ECU's automatically get richer as the engine temp increases, the air/fuel ratio is changing constantly at a non linear rate. "
I don't know how it will apply to the 919,but just a thought.
Generaly FI will adjust for the increased flow of exhaust in air/fuel to keep the mixture ratio right in accordence to factory settings,question is how much of a range perameter did honda give it?
If it goes out of range you get a check engine light.
Remapping just gets out all the motor has to offer in the most efficent way, More Power= More Fun!
Because a bike is fuel injected doesn't mean it will adjust for increased airflow. It has to have an exhaust sensor or a mass airflow sensor to know it has more airflow. I don't think the 9er has either. 2D mapping vs. 3D mapping. It may "compensate" based on engine temp or something, but it doesn't know the inlet airflow quantity/exiting mixture.
"Towards the end of the vid, it looks like she may have had a bafflectomy." - MarylandMike
The Staintune mufflers also have steel wool so they never require a repack. The finnish is the best, but they are also the most expensive. They are good if you don't want lots of noise. They also come with a quiet insert.
Sato's are the most popular by far because of their good quality and titanium construction. They are middle of the road on price.
The Erion Racing mufflers are cheaper still and use a ceramic coated fiber so they keep their packing in longer. They come in black painted stainless.
The only mufflers you shouldn't buy are Two Brothers. Everyone I know that has them have "can cancer". They will look like crap after one season.
I would seriously doubt it. Would it run leaner, especially with an air filter mod also, probably. Enough to trash it? Nah. Not if it's a Honda.
I doubt Hondas would have a problem, but I did hear of a guy on the KZrider forum who toasted a piston because his MAC exhaust leaned his mix out too much. Of course, we're talking 80's tech vs. current tech, so take that with a grain of salt...
2002 919 40,000 miles
"racing is life...everything else is just waiting"